Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-20 Thread Wes 
After writing this, I dug it out and without removing the board to inspect just 
powered it up and measured Pin 8 of U2 and found -8 something V.  So I guess 
it's okay.


Wes  N7WS



On 11/19/2020 1:45 PM, Wes wrote:
Thanks. I've owned one of these for years and as I recall, it's always been a 
problem so it's been resigned to the junk box.


Maybe I can resurrect it to make it useful for something.

Wes  N7WS


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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Rich 
My issue is getting mine to work with an Icom as a band decoder for my 
band pass filter.  At one time it worked great with my Pro III, but I 
cannot get it to work with the 7300.   Elecraft provided help to no 
avail either.   Everything checks out fine.


Rich

On 11/19/2020 18:41 PM, Paul Fletcher wrote:

Should be fine - you don’t have the issue I had.


On 19 Nov 2020, at 23:37, Rich > wrote:


Well I have a negative voltage on U2 pin8 but it is 3 volts higher 
than the manual.   Probably not an issue


Rich

On 11/19/2020 16:58 PM, Paul Fletcher wrote:
The circuit diagram and the parts placement in the manual are 
correct. On mine it was the silkscreen for R12 and R13 that was 
reversed. Let Jack do some digging as it’s possible (from his 
comments) that this doesn’t affect all boards. Mine only arrived a 
few days ago. The easy way to check if there is an issue is to check 
there is the correct negative voltage on pin 8 of U2. Mine was 
almost 0V before swapping the resistors.


On 19 Nov 2020, at 21:41, Rich > wrote:


Thanks for the info.   Could you post the correct value of R12 and R13?

Mine was back at Elecraft way back.   I want to make sure it is 
already not corrected


Based on your info R12 should be 47ohm, correct?


Thanks

Rich

On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked 
like a champ with my K2 but not so with my KX3.


I’m going to crack open my krc2 shortly and see what values I have 
in those two resistor locations.


What radio where you using with the KRC2?

Paul
W6PNG/M0SNA
www.nomadic.blog 


On Nov 19, 2020, at 12:47 PM, Wes  wrote:

Thanks.  I've owned one of these for years and as I recall, it's 
always been a problem so it's been resigned to the junk box.


Maybe I can resurrect it to make it useful for something.

Wes  N7WS


On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
FAO anyone who's had issues getting the serial comms working on 
a KRC2:


R12 and R13 are transposed on the silkscreen on the PCB. I fell 
foul of this
when I recently built my KRC2 and it wouldn't communicate. After 
quick probe
around it was evident there was no negative voltage to the RS232 
driver, U2.
A little further probing revealed no 12V present at R13 but 
there was at
R12. It was then I realised the component layout in the manual 
is different
to that marked on the PCB. A quick swap of resistors and 
everything works as

it should.

I've re-read the errata and the manual and there is no reference 
to this
issue. Apologies if it's been flagged up on here already but I 
couldn't find
anyone pointing this out though there do seem to be a few people 
with serial

comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Paul Fletcher via Elecraft 
Should be fine - you don’t have the issue I had.


> On 19 Nov 2020, at 23:37, Rich  wrote:
> 
> Well I have a negative voltage on U2 pin8 but it is 3 volts higher than the 
> manual.   Probably not an issue
> 
> Rich
> 
> On 11/19/2020 16:58 PM, Paul Fletcher wrote:
>> The circuit diagram and the parts placement in the manual are correct. On 
>> mine it was the silkscreen for R12 and R13 that was reversed. Let Jack do 
>> some digging as it’s possible (from his comments) that this doesn’t affect 
>> all boards. Mine only arrived a few days ago. The easy way to check if there 
>> is an issue is to check there is the correct negative voltage on pin 8 of 
>> U2. Mine was almost 0V before swapping the resistors.
>> 
>>> On 19 Nov 2020, at 21:41, Rich >> > wrote:
>>> 
>>> Thanks for the info.   Could you post the correct value of R12 and R13?
>>> 
>>> Mine was back at Elecraft way back.   I want to make sure it is already not 
>>> corrected
>>> 
>>> Based on your info R12 should be 47ohm, correct?
>>> 
>>> 
>>> Thanks
>>> 
>>> Rich
>>> 
>>> On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:
 Hi Paul
 
 Thanks for the heads up.
 
 I had some communication issues with my KRC2 in that it worked like a 
 champ with my K2 but not so with my KX3.
 
 I’m going to crack open my krc2 shortly and see what values I have in 
 those two resistor locations.
 
 What radio where you using with the KRC2?
 
 Paul
 W6PNG/M0SNA
 www.nomadic.blog 
 
> On Nov 19, 2020, at 12:47 PM, Wes  
>  wrote:
> 
> Thanks.  I've owned one of these for years and as I recall, it's always 
> been a problem so it's been resigned to the junk box.
> 
> Maybe I can resurrect it to make it useful for something.
> 
> Wes  N7WS
> 
>> On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>> 
>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of 
>> this
>> when I recently built my KRC2 and it wouldn't communicate. After quick 
>> probe
>> around it was evident there was no negative voltage to the RS232 driver, 
>> U2.
>> A little further probing revealed no 12V present at R13 but there was at
>> R12. It was then I realised the component layout in the manual is 
>> different
>> to that marked on the PCB. A quick swap of resistors and everything 
>> works as
>> it should.
>> 
>> I've re-read the errata and the manual and there is no reference to this
>> issue. Apologies if it's been flagged up on here already but I couldn't 
>> find
>> anyone pointing this out though there do seem to be a few people with 
>> serial
>> comms issues with the KRC2.
>> 
>> Hopefully this is of assistance to someone.
>> 
>> 73 Paul M1PAF
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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Rich 
Well I have a negative voltage on U2 pin8 but it is 3 volts higher than 
the manual.   Probably not an issue


Rich

On 11/19/2020 16:58 PM, Paul Fletcher wrote:
The circuit diagram and the parts placement in the manual are correct. 
On mine it was the silkscreen for R12 and R13 that was reversed. Let 
Jack do some digging as it’s possible (from his comments) that this 
doesn’t affect all boards. Mine only arrived a few days ago. The easy 
way to check if there is an issue is to check there is the correct 
negative voltage on pin 8 of U2. Mine was almost 0V before swapping 
the resistors.


On 19 Nov 2020, at 21:41, Rich > wrote:


Thanks for the info.   Could you post the correct value of R12 and R13?

Mine was back at Elecraft way back.   I want to make sure it is 
already not corrected


Based on your info R12 should be 47ohm, correct?


Thanks

Rich

On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked like 
a champ with my K2 but not so with my KX3.


I’m going to crack open my krc2 shortly and see what values I have 
in those two resistor locations.


What radio where you using with the KRC2?

Paul
W6PNG/M0SNA
www.nomadic.blog 


On Nov 19, 2020, at 12:47 PM, Wes  wrote:

Thanks.  I've owned one of these for years and as I recall, it's 
always been a problem so it's been resigned to the junk box.


Maybe I can resurrect it to make it useful for something.

Wes  N7WS


On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
FAO anyone who's had issues getting the serial comms working on a 
KRC2:


R12 and R13 are transposed on the silkscreen on the PCB. I fell 
foul of this
when I recently built my KRC2 and it wouldn't communicate. After 
quick probe
around it was evident there was no negative voltage to the RS232 
driver, U2.
A little further probing revealed no 12V present at R13 but there 
was at
R12. It was then I realised the component layout in the manual is 
different
to that marked on the PCB. A quick swap of resistors and 
everything works as

it should.

I've re-read the errata and the manual and there is no reference 
to this
issue. Apologies if it's been flagged up on here already but I 
couldn't find
anyone pointing this out though there do seem to be a few people 
with serial

comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Paul Fletcher via Elecraft 
The circuit diagram and the parts placement in the manual are correct. On mine 
it was the silkscreen for R12 and R13 that was reversed. Let Jack do some 
digging as it’s possible (from his comments) that this doesn’t affect all 
boards. Mine only arrived a few days ago. The easy way to check if there is an 
issue is to check there is the correct negative voltage on pin 8 of U2. Mine 
was almost 0V before swapping the resistors.

> On 19 Nov 2020, at 21:41, Rich  wrote:
> 
> Thanks for the info.   Could you post the correct value of R12 and R13?
> 
> Mine was back at Elecraft way back.   I want to make sure it is already not 
> corrected
> 
> Based on your info R12 should be 47ohm, correct?
> 
> 
> Thanks
> 
> Rich
> 
> On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:
>> Hi Paul
>> 
>> Thanks for the heads up.
>> 
>> I had some communication issues with my KRC2 in that it worked like a champ 
>> with my K2 but not so with my KX3.
>> 
>> I’m going to crack open my krc2 shortly and see what values I have in those 
>> two resistor locations.
>> 
>> What radio where you using with the KRC2?
>> 
>> Paul
>> W6PNG/M0SNA
>> www.nomadic.blog
>> 
>>> On Nov 19, 2020, at 12:47 PM, Wes  wrote:
>>> 
>>> Thanks.  I've owned one of these for years and as I recall, it's always 
>>> been a problem so it's been resigned to the junk box.
>>> 
>>> Maybe I can resurrect it to make it useful for something.
>>> 
>>> Wes  N7WS
>>> 
 On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
 FAO anyone who's had issues getting the serial comms working on a KRC2:
 
 R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of 
 this
 when I recently built my KRC2 and it wouldn't communicate. After quick 
 probe
 around it was evident there was no negative voltage to the RS232 driver, 
 U2.
 A little further probing revealed no 12V present at R13 but there was at
 R12. It was then I realised the component layout in the manual is different
 to that marked on the PCB. A quick swap of resistors and everything works 
 as
 it should.
 
 I've re-read the errata and the manual and there is no reference to this
 issue. Apologies if it's been flagged up on here already but I couldn't 
 find
 anyone pointing this out though there do seem to be a few people with 
 serial
 comms issues with the KRC2.
 
 Hopefully this is of assistance to someone.
 
 73 Paul M1PAF
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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Jack Brindle via Elecraft 
Please do. Also, please also send a picture of the label on the bottom side 
closest to the front of the device.

Jack, W6FB
Elecraft Engineering


> On Nov 19, 2020, at 1:47 PM, Paul Fletcher  wrote:
> 
> I have a Rev C PCB and the silkscreen does not match the diagram in the Rev C 
> manual. On the PCB R12 and R13 are marked the opposite way round to the 
> manual. I can send pics if you want them.
> 
>> On 19 Nov 2020, at 21:33, Jack Brindle  wrote:
>> 
>> After seeing this report I pulled the Rev C PCB (the only PCB we have 
>> shipped for this product) and took a good look at it, then looked at the 
>> docs and finally the Gerbers for the board.
>> R12 and R13 on the KRC2 PCB are properly labelled. R12, closest to the 
>> switches, is a 4.7K ohm resistor (yellow-violet-red) used to pull the RS232 
>> line to -12V.
>> R13 is next to it, closest to the DE9 connectors is a 47 ohm resistor 
>> (yellow-violet-black) and provides +12V power for the JFET.
>> The legends on the PCB and in Figure 10 of the KRC2 Rev C manual are correct.
>> 
>> Now, what caused you to think they were backwards? And, let’s make sure that 
>> you do have a Rev C board in your KRC2.
>> 
>> 73,
>> Jack, W6FB
>> 
>>> On Nov 19, 2020, at 11:58 AM, Paul Fletcher via Elecraft 
>>>  wrote:
>>> 
>>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>>> 
>>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>>> around it was evident there was no negative voltage to the RS232 driver, U2.
>>> A little further probing revealed no 12V present at R13 but there was at
>>> R12. It was then I realised the component layout in the manual is different
>>> to that marked on the PCB. A quick swap of resistors and everything works as
>>> it should.
>>> 
>>> I've re-read the errata and the manual and there is no reference to this
>>> issue. Apologies if it's been flagged up on here already but I couldn't find
>>> anyone pointing this out though there do seem to be a few people with serial
>>> comms issues with the KRC2.
>>> 
>>> Hopefully this is of assistance to someone.
>>> 
>>> 73 Paul M1PAF
>>> 
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>> 
> 

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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Paul Fletcher via Elecraft 
I have a Rev C PCB and the silkscreen does not match the diagram in the Rev C 
manual. On the PCB R12 and R13 are marked the opposite way round to the manual. 
I can send pics if you want them.

> On 19 Nov 2020, at 21:33, Jack Brindle  wrote:
> 
> After seeing this report I pulled the Rev C PCB (the only PCB we have shipped 
> for this product) and took a good look at it, then looked at the docs and 
> finally the Gerbers for the board.
> R12 and R13 on the KRC2 PCB are properly labelled. R12, closest to the 
> switches, is a 4.7K ohm resistor (yellow-violet-red) used to pull the RS232 
> line to -12V.
> R13 is next to it, closest to the DE9 connectors is a 47 ohm resistor 
> (yellow-violet-black) and provides +12V power for the JFET.
> The legends on the PCB and in Figure 10 of the KRC2 Rev C manual are correct.
> 
> Now, what caused you to think they were backwards? And, let’s make sure that 
> you do have a Rev C board in your KRC2.
> 
> 73,
> Jack, W6FB
> 
>> On Nov 19, 2020, at 11:58 AM, Paul Fletcher via Elecraft 
>>  wrote:
>> 
>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>> 
>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>> around it was evident there was no negative voltage to the RS232 driver, U2.
>> A little further probing revealed no 12V present at R13 but there was at
>> R12. It was then I realised the component layout in the manual is different
>> to that marked on the PCB. A quick swap of resistors and everything works as
>> it should.
>> 
>> I've re-read the errata and the manual and there is no reference to this
>> issue. Apologies if it's been flagged up on here already but I couldn't find
>> anyone pointing this out though there do seem to be a few people with serial
>> comms issues with the KRC2.
>> 
>> Hopefully this is of assistance to someone.
>> 
>> 73 Paul M1PAF
>> 
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> 

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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Gordon LaPoint 
I have two KRC2's, one uses the aux-bus line with a K3 and the other 
uses the RS232 with a Kenwood TS590sg. The only problems I have had are 
all self induced with programing errors!
They both work flawlessly and have for years, one drives a WX0b Six Pak, 
the other drives a MFJ RCS-20Lx switch.

Gordon - N1MGO

On 11/19/2020 16:26 PM, Paul Fletcher via Elecraft wrote:

Hi Paul,

I’ve not used it with a radio yet, this was to communicate with a PC to 
configure the KRC2 (though the same issue would apply to anything using RS232). 
The KRC2 wasn’t responding at all hence the start of fault finding and the 
findings I posted. As soon as the resistors were corrected everything worked as 
it should without issue.

Hope this helps.

73 Paul M1PAF


On 19 Nov 2020, at 20:52, Paul GACEK via Elecraft  
wrote:

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked like a champ 
with my K2 but not so with my KX3.

I’m going to crack open my krc2 shortly and see what values I have in those two 
resistor locations.

What radio where you using with the KRC2?

Paul
W6PNG/M0SNA
www.nomadic.blog 


On Nov 19, 2020, at 12:47 PM, Wes mailto:wes_n...@triconet.org>> wrote:

Thanks.  I've owned one of these for years and as I recall, it's always been a 
problem so it's been resigned to the junk box.

Maybe I can resurrect it to make it useful for something.

Wes  N7WS


On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
FAO anyone who's had issues getting the serial comms working on a KRC2:

R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
when I recently built my KRC2 and it wouldn't communicate. After quick probe
around it was evident there was no negative voltage to the RS232 driver, U2.
A little further probing revealed no 12V present at R13 but there was at
R12. It was then I realised the component layout in the manual is different
to that marked on the PCB. A quick swap of resistors and everything works as
it should.

I've re-read the errata and the manual and there is no reference to this
issue. Apologies if it's been flagged up on here already but I couldn't find
anyone pointing this out though there do seem to be a few people with serial
comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Rich 

Thanks for the info.   Could you post the correct value of R12 and R13?

Mine was back at Elecraft way back.   I want to make sure it is already 
not corrected


Based on your info R12 should be 47ohm, correct?


Thanks

Rich

On 11/19/2020 15:52 PM, Paul GACEK via Elecraft wrote:

Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked like a champ 
with my K2 but not so with my KX3.

I’m going to crack open my krc2 shortly and see what values I have in those two 
resistor locations.

What radio where you using with the KRC2?

Paul
W6PNG/M0SNA
www.nomadic.blog


On Nov 19, 2020, at 12:47 PM, Wes  wrote:

Thanks.  I've owned one of these for years and as I recall, it's always been a 
problem so it's been resigned to the junk box.

Maybe I can resurrect it to make it useful for something.

Wes  N7WS


On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
FAO anyone who's had issues getting the serial comms working on a KRC2:

R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
when I recently built my KRC2 and it wouldn't communicate. After quick probe
around it was evident there was no negative voltage to the RS232 driver, U2.
A little further probing revealed no 12V present at R13 but there was at
R12. It was then I realised the component layout in the manual is different
to that marked on the PCB. A quick swap of resistors and everything works as
it should.

I've re-read the errata and the manual and there is no reference to this
issue. Apologies if it's been flagged up on here already but I couldn't find
anyone pointing this out though there do seem to be a few people with serial
comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Jack Brindle via Elecraft 
After seeing this report I pulled the Rev C PCB (the only PCB we have shipped 
for this product) and took a good look at it, then looked at the docs and 
finally the Gerbers for the board.
R12 and R13 on the KRC2 PCB are properly labelled. R12, closest to the 
switches, is a 4.7K ohm resistor (yellow-violet-red) used to pull the RS232 
line to -12V.
R13 is next to it, closest to the DE9 connectors is a 47 ohm resistor 
(yellow-violet-black) and provides +12V power for the JFET.
The legends on the PCB and in Figure 10 of the KRC2 Rev C manual are correct.

Now, what caused you to think they were backwards? And, let’s make sure that 
you do have a Rev C board in your KRC2.

73,
Jack, W6FB

> On Nov 19, 2020, at 11:58 AM, Paul Fletcher via Elecraft 
>  wrote:
> 
> FAO anyone who's had issues getting the serial comms working on a KRC2:
> 
> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
> when I recently built my KRC2 and it wouldn't communicate. After quick probe
> around it was evident there was no negative voltage to the RS232 driver, U2.
> A little further probing revealed no 12V present at R13 but there was at
> R12. It was then I realised the component layout in the manual is different
> to that marked on the PCB. A quick swap of resistors and everything works as
> it should.
> 
> I've re-read the errata and the manual and there is no reference to this
> issue. Apologies if it's been flagged up on here already but I couldn't find
> anyone pointing this out though there do seem to be a few people with serial
> comms issues with the KRC2.
> 
> Hopefully this is of assistance to someone.
> 
> 73 Paul M1PAF
> 
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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Paul Fletcher via Elecraft 
Hi Paul,

I’ve not used it with a radio yet, this was to communicate with a PC to 
configure the KRC2 (though the same issue would apply to anything using RS232). 
The KRC2 wasn’t responding at all hence the start of fault finding and the 
findings I posted. As soon as the resistors were corrected everything worked as 
it should without issue.

Hope this helps.

73 Paul M1PAF

> On 19 Nov 2020, at 20:52, Paul GACEK via Elecraft  
> wrote:
> 
> Hi Paul
> 
> Thanks for the heads up.
> 
> I had some communication issues with my KRC2 in that it worked like a champ 
> with my K2 but not so with my KX3.
> 
> I’m going to crack open my krc2 shortly and see what values I have in those 
> two resistor locations.
> 
> What radio where you using with the KRC2?
> 
> Paul
> W6PNG/M0SNA 
> www.nomadic.blog 
> 
>> On Nov 19, 2020, at 12:47 PM, Wes > > wrote:
>> 
>> Thanks.  I've owned one of these for years and as I recall, it's always 
>> been a problem so it's been resigned to the junk box.
>> 
>> Maybe I can resurrect it to make it useful for something.
>> 
>> Wes  N7WS
>> 
>>> On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
>>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>>> 
>>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>>> around it was evident there was no negative voltage to the RS232 driver, U2.
>>> A little further probing revealed no 12V present at R13 but there was at
>>> R12. It was then I realised the component layout in the manual is different
>>> to that marked on the PCB. A quick swap of resistors and everything works as
>>> it should.
>>> 
>>> I've re-read the errata and the manual and there is no reference to this
>>> issue. Apologies if it's been flagged up on here already but I couldn't find
>>> anyone pointing this out though there do seem to be a few people with serial
>>> comms issues with the KRC2.
>>> 
>>> Hopefully this is of assistance to someone.
>>> 
>>> 73 Paul M1PAF
>> 
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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Paul GACEK via Elecraft 
Hi Paul

Thanks for the heads up.

I had some communication issues with my KRC2 in that it worked like a champ 
with my K2 but not so with my KX3.

I’m going to crack open my krc2 shortly and see what values I have in those two 
resistor locations.

What radio where you using with the KRC2?

Paul
W6PNG/M0SNA 
www.nomadic.blog

> On Nov 19, 2020, at 12:47 PM, Wes  wrote:
> 
> Thanks.  I've owned one of these for years and as I recall, it's always been 
> a problem so it's been resigned to the junk box.
> 
> Maybe I can resurrect it to make it useful for something.
> 
> Wes  N7WS
> 
>> On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>> 
>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>> around it was evident there was no negative voltage to the RS232 driver, U2.
>> A little further probing revealed no 12V present at R13 but there was at
>> R12. It was then I realised the component layout in the manual is different
>> to that marked on the PCB. A quick swap of resistors and everything works as
>> it should.
>> 
>> I've re-read the errata and the manual and there is no reference to this
>> issue. Apologies if it's been flagged up on here already but I couldn't find
>> anyone pointing this out though there do seem to be a few people with serial
>> comms issues with the KRC2.
>> 
>> Hopefully this is of assistance to someone.
>> 
>> 73 Paul M1PAF
> 
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Re: [Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Wes 
Thanks.  I've owned one of these for years and as I recall, it's always been a 
problem so it's been resigned to the junk box.


Maybe I can resurrect it to make it useful for something.

Wes  N7WS

On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:

FAO anyone who's had issues getting the serial comms working on a KRC2:

R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
when I recently built my KRC2 and it wouldn't communicate. After quick probe
around it was evident there was no negative voltage to the RS232 driver, U2.
A little further probing revealed no 12V present at R13 but there was at
R12. It was then I realised the component layout in the manual is different
to that marked on the PCB. A quick swap of resistors and everything works as
it should.

I've re-read the errata and the manual and there is no reference to this
issue. Apologies if it's been flagged up on here already but I couldn't find
anyone pointing this out though there do seem to be a few people with serial
comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF


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[Elecraft] KRC2 silkscreen gotcha

2020-11-19 Thread Paul Fletcher via Elecraft 
FAO anyone who's had issues getting the serial comms working on a KRC2:

R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
when I recently built my KRC2 and it wouldn't communicate. After quick probe
around it was evident there was no negative voltage to the RS232 driver, U2.
A little further probing revealed no 12V present at R13 but there was at
R12. It was then I realised the component layout in the manual is different
to that marked on the PCB. A quick swap of resistors and everything works as
it should.

I've re-read the errata and the manual and there is no reference to this
issue. Apologies if it's been flagged up on here already but I couldn't find
anyone pointing this out though there do seem to be a few people with serial
comms issues with the KRC2.

Hopefully this is of assistance to someone.

73 Paul M1PAF

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